Probabilistic Seismic Assessment of Steel Frames under Consecutive Earthquakes: A Comparison between Moment Frames and Linked-Column Frames

Document Type : Research Article


1 School of Civil Engineering, Iran University of Science and Technology

2 Postdoctoral Fellow, Iran University of Science and Technology


Recent studies show that aftershocks can intensify structural damage and even lead to the collapse of the structures. Among the structural systems, moment frames show desirable ductility, but in such systems damage spreads in many structural elements. Accordingly, it is possible for these systems to experience more severe damage during an earthquake. Recently, Linked-Column Frame (LCF) is introduced to limit structural damage in moment frames, which can prevent the formation of plastic hinges in major structural members. However, only a limited number of investigations are carried out on these systems, and there is a lack of study that investigates post-mainshock performance of this system. The aim of this study is to investigate the influence of mainshock-aftershock (MS-AS) sequence on LCF system and compare the results with conventional moment frames. For this reason, SAC 3-story building, which is designed according to UBC-94, is modeled and analyzed in OpenSEES software package. In the first step, behavior of these structures is investigated using nonlinear dynamic analysis. In the next step, incremental dynamic analysis is employed for different performance levels including IO, LS, and CP states to gain a better insight into the behavior of these structures in MS-AS sequences. Results showed that MS-AS sequences could lead to increase in drift response of the frames with both systems. However, LCF showed a superior performance during seismic sequences.


Main Subjects

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